http://www.orthosupersite.com/view.aspx?rid=94998
A more normal
gait at higher speeds is attained through
hip resurfacing arthroplasty as compared to standard
total hip arthroplasty, according to a study presented at the American
Academy of Orthopaedic Surgeons 2012 Annual Meeting.
Anatole V. Wiik, MBBS and his team, performed a case control study with 63
patients – 21 total hip arthroplasty (THA), 21 hip resurfacing arthroplasty (HRA)
and 21 healthy controls, all matched for age and gender, with experimental
groups all being at least 24 months removed from their arthroplasties – which
involved each participant using an instrumented treadmill…
…Speed, cadence, stride length, stop length, impulse, progression angle, base
of support, maximum forces at heel strike, mid-stance and push off were all
measured, …with the procedure taking around a reported
12 minutes of continuous walking and reaching completion without difficulty.
At preferred walking speeds… the two
groups were indistinguishable. Top walking speed, however, revealed that the HRA
group could walk faster – achieving a mean of 2.08 m/sec, compared to the 1.89
m/sec reached in the THA group, for a difference of 9%. The difference… appeared to be due to a longer stride length for the HRA group
at higher speeds, along with a higher cadence.
“This was a small study, non-randomized,” Wiik said, “so conclusions must be
made cautiously. However, our study was well-matched with an appropriate control
group and total hip replacement patients are 9% slower.”

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